> >> for a pure hibernate mode, you will be powering off the box after saving> >> the suspend image. why are there any special ACPI modes involved?> >> > Because, for example, on my machine the status of power supply (present> > vs not present) is not updated correctly after the restore if ACPI callbacks> > aren't used during the hibernation. That's just experience and it's in line> > with the ACPI spec.> > so if a machine is actually powered off the /dev/suspend process won't > work?> > remember that the system may run a different OS between the hibernate and > the resume, makeing any assumptions about what state the hardware is in > when you start the resume is a problem.

As I understand it, running a different OS between the hibernate and the resume would violate the ACPI spec.